Abstract: To resolve the problems of false alarm and alarm failure of monitor system, we tested the distribution of electromagnetic interference of underground representative regions in Pingdingshan Coal Group No.4 Mine. According to the distribution characteristics of radiated interference, we used simulation and experimental test method to optimize the shielding shell and enhance the electromagnetic shielding effectiveness, and solved the alarm failure and false alarm problem of mine safety monitoring system in roadways to improve the electromagnetic compatibility of mine safety monitoring system under the premise of meeting the requirements of explosion-proof, which lays a solid foundation for reliable operation of mine safety monitor system.